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Consolidated statement of financial position (Parenthetical) - $ / shares | Dec. 31, 2017 | Dec. 31, 2016
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Class A common stock [member] |  |
Common stock, shares issued | 33,776,480 | 33,743,286
Common stock, shares outstanding | 31,185,641 | 31,112,356
Class B common stock [member] |  |
Common stock, shares issued | 10,938,125 | 10,938,125
Common stock, shares outstanding | 10,938,125 | 10,938,125
Common stock, no par value |  |

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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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